KR100866446B1 - Data recording device, data recording method, and recording medium - Google Patents

Abstract

A moving picture processing apparatus for generating a representative still image from moving picture data recorded on a recording medium, wherein the image acquisition position information specifying an image acquisition position on the moving image data is acquired, and the image specified in the acquired image acquisition position information from the moving image data. A moving picture processing apparatus which acquires a reproduced image at an acquisition position as a representative still image and records the acquired image acquisition position information in association with information specifying moving image data on a recording medium.

Playback images, recording media, moving images, information compression processing, DVD-RW

Description

Data recording device, data recording method, and storage medium {DATA RECORDING DEVICE, DATA RECORDING METHOD, AND RECORDING MEDIUM}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a data recording apparatus for recording data, a data recording method, and a computer-readable storage medium storing a program on a recording medium having a limited capacity of a storage area such as a DVD-RW.

In general, when storing large data such as moving image data on a recording medium such as a DVD (Digital Versatile Disk) -RW, it is widely used to store the data by performing information compression processing instead of storing the data as it is. For example, in the case of moving picture data, various compression methods defined by a group of standards called MPEG (Motion Picture Experts Group) are used.

Here, as a method of compressing moving picture data when recording on a DVD-RW, there are a plurality of compression methods having different compression efficiencies in stages. That is, select one of a plurality of compression efficiency stages according to the purpose, such as HQ (high definition), HSP (quality priority), SP (standard), LP (time priority), EP (long time), SLP (extended time), etc. The compression process is performed.

By the way, the storage capacity of a DVD-RW or the like has a storage capacity limit, and it is impossible to record beyond this capacity. For example, when a plurality of moving image data is to be recorded on one DVD-RW, it is impossible to record all of the moving image data when the total of the size of the moving image data exceeds the storage capacity of about 4.7 Gbytes. However, in some cases, the size can be adjusted so that the whole can be recorded by increasing the compression efficiency of some of them. In other words, the size of the moving image data is reduced by partially compressing the moving image data in a mode that gives priority to time at the expense of the image quality.

The same is not limited to DVD-RW. Similarly, DVD-R and DVD + RW, which are recording media for moving picture data, are the same, and not only moving picture data but also CD-R for recording music data. The same is true for the various recording media storing the data.

In addition, Non-Patent Document 1 discloses an example of a general DVD recorder employing a staged compression method.

[Non-Patent Document 1] Pioneer, DVD Recorder Catalog, March 2004

However, in the conventional data recording apparatus, the user has to adjust the size by recompressing the data by himself, and the convenience is low. For this reason, it is a phenomenon that when the compression method is changed, a simple solution such as recording on one recording medium and recording on two recording media is adopted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a data recording apparatus, a data recording method, and a program which can improve the convenience of data size adjustment.

The present invention for solving the problems of the conventional example is a data recording apparatus for recording a plurality of recording target data on a recording medium having a storage area having a predetermined capacity, and is characterized in that when the plurality of recording target data is recorded on the recording medium. Prediction capacity calculating means for calculating an estimated value of total capacity, recompression candidate selecting means for selecting at least one of the plurality of recording target data as a recompression candidate when the calculated predicted value exceeds the predetermined capacity; And a recompression means for changing the compression method of the recording target data selected as the recompression candidate, and for performing compression processing in a higher compression efficiency method.

1 is a block diagram showing an example of a data recording apparatus according to an embodiment of the present invention.

2 is a functional block diagram illustrating an example of a data recording apparatus according to an embodiment of the present invention.

3 is an explanatory diagram showing an example of a compression setting table.

4 is a flowchart showing an operation example of a data recording apparatus according to the embodiment of the present invention.

Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the data recording apparatus of the present embodiment includes a control unit 11, a storage unit 12, a hard disk 13, an operation unit 14, a display unit 15, and a recording medium drive. It is comprised including 16.

The control unit 11 is realized using an MPU (Micro Processing Unit) or the like. The control unit 11 operates in accordance with a program stored in the storage unit 12, and performs processing for recording a plurality of recording target data on a recording medium having a storage area of a predetermined capacity. At this time, the control unit 11 calculates an estimated value of the total capacity when the plurality of recording target data is recorded on the recording medium, and recompresses at least one of the recording target data when the predicted value exceeds the capacity of the recording medium. The process of selecting as a candidate, changing the compression method of the recording target data selected as the recompression candidate, and performing compression processing in a method with higher compression efficiency is performed. The specific content of each of these processes is explained in full detail later. In this case, a rewritable recording medium related to DVD technology such as DVD-RW or DVD + RW is collectively referred to as "DVD".

The storage unit 12 is configured to include memory elements such as random access memory (RAM) and read only memory (ROM). In the storage unit 12, a program executed by the control unit 11 is stored. This program may be stored in a computer-readable recording medium such as a CD-ROM or a DVD-ROM. In this case, the recording medium drive 16 reads out the program and copies it to the hard disk 13. At the time of execution, the control unit 11 copies the program from the hard disk 13 to the storage unit 12, and reads the program copied onto the storage unit 12 for execution. The storage unit 12 also operates as a work memory that temporarily holds various types of data generated by the processing of the control unit 11. The hard disk 13 is a recording medium that stores and holds moving image data and the like.

The operation unit 14 is a keyboard, a mouse, a game controller, a button, a remote controller, or the like. The operation unit 14 receives a user's instruction operation and outputs the contents of the instruction operation to the controller 11. The display part 15 is comprised including a display controller, and outputs the video signal based on image data to an external display, a television, etc. according to the instruction input from the control part 11. In addition, the display unit 15 may include a light emitting element such as an LED, and the light emitting element is turned on or off based on a signal input from each part such as the control unit 11 or the hard disk 13.

The recording medium drive 16 receives a recording medium having a storage area having a predetermined capacity, such as a CD-R, a DVD, a Blu-ray Disc (trademark), and the like, according to an instruction input from the control unit 11. Information is stored in the storage medium or information is read from the recording medium and output to the control unit 11. Although the hard disk 13 is also one of the recording media, the media set in the recording medium drive 16 will be referred to as " recording medium " for the purpose of explanation, and the " hard disk " I call it.

Here, the specific content of the process performed by the control part 11 is demonstrated. In the following example, a case of copying and storing a part of a plurality of processing target data (herein referred to as moving picture data) stored in the hard disk 13 to a recording medium such as a DVD-RW will be described as an example. The program executed by the control unit 11 is functionally as shown in Fig. 2, as shown in Fig. 2, the predictive capacity operation unit 21, the determination unit 22, the recompression candidate selection unit 23, and the compression processing unit 24. ), Including

The control unit 11 stores, in the storage unit 12 as a work memory, information for specifying each of the moving image data (that is, the recording target data) to be copied by an instruction operation from the user. The information for specifying the moving picture data here may be, for example, the name of a file including the moving picture data.

In addition, the control unit 11 changes the information indicating the recording target data specified by the user (for example, the file name of the recording target data, etc.), the setting of each compression method, and the setting of the compression method from the time of initialization. The change flag indicating is stored in the storage unit 12 as a compression setting table (Fig. 3). The setting of this compression method may be set as the compression method (state stored in the hard disk 13) at the point of time specified by the user at the time of initialization. 3 shows that the change flag is " 0 " when the setting of the compression method has not changed since the initialization, and the change flag is " 1 "

When the user completes the specification of the recording target data or when the user is instructed to calculate the predicted value by the determination unit 22, the control unit 11 starts the processing of the predicted capacity calculation unit 21 and starts the storage unit 12. The estimated value of the sum of the predicted sizes when the respective recording target data is stored in the recording medium is calculated by referring to the compression setting table stored in the " This predicted value is, for example, when the recording target data is moving picture data, the time taken to reproduce the entire moving picture data, and the average compression efficiency of the compression method specified for the moving picture data (this value is stored in advance in the storage unit 12). It should be stored based on).

The determining unit 22 checks whether the predicted value calculated by the predictive capacity calculating unit 21 exceeds the capacity of the recording medium. The determination section 22 instructs the recompression candidate selection section 23 to select a recompression candidate when the predicted value exceeds the remaining capacity of the recording medium (the predetermined capacity of the present invention). The compression setting table stored in the storage unit 12 is updated by changing the setting of the compression method of the selected recompression candidate. The predicted capacity calculating section 21 is then instructed to calculate the predicted value again.

When the predicted value does not exceed the capacity of the recording medium, the determination unit 22 refers to the change flag on the compression setting table, and stores in the storage unit 12 if any of the recording target data has changed the compression method setting. The compression processing unit 24 is instructed to compress each recording target data based on the settings presented in the compression setting table. If the setting of the compression method is not changed for any recording target data, it is determined that recording is possible on the recording medium by the current compression method, and the result of the determination is output.

When the recompression candidate selection unit 23 receives an instruction from the determination unit 22 to select the recompression candidate, at least one of the recording target data is selected as the recompression candidate according to a predetermined selection rule. The compression setting table is rewritten to change the compression method of the selected recompression candidate. As described above, the moving picture data has a plurality of compression efficiency depending on the purpose, such as HQ (high definition), HSP (quality priority), SP (standard), LP (time priority), EP (long time), SLP (extended time), etc. The compression process is performed by any one of steps. Thus, in this embodiment, for example, one step of the compression efficiency of the selected recording target data is increased. Specifically, the selection rule may be a rule for checking the size of each recording target data and selecting the recording target data having the largest size as the recompression candidate. The recompression candidate selecting section 23 rewrites the compression setting table based on the result of the selection.

The compression processing unit 24 compresses each recording target data while referring to the compression setting table. Specifically, the compression processing unit 24 refers to the change flag in the compression setting table, and finds the recording target data (recording target data that has been recompressed candidate) whose compression method has been changed from the state at the time of initialization. The re-compression candidate recording target data is compressed by the compression method presented in the compression setting table. Specifically, in the case where the moving image data as the recording target data of the recompression candidate is compressed at the SP, if the moving image data compression method is LP on the compression setting table, the moving image data is recompressed by the LP compression method. . This recompression method is a process well known as " rate conversion ", and thus detailed description thereof is omitted. The compression processing unit 24 outputs information indicating that the recompression processing is completed when the recompression processing of the recording target data of the selected recompression candidate is completed.

In this case, the case where the recording target data is moving picture data is described as an example, but even general data can be recompressed with higher compression efficiency by the following method. That is, the data to be recorded once decompressed can be decompressed (thawed), and the decompressed (thawed) data can be compressed using a compression method having a high compression efficiency.

Next, the operation of the data recording apparatus of the present embodiment will be described. In the following example, a case where a part of a plurality of moving picture data stored in the hard disk 13 is copied to a recording medium such as a DVD-RW and stored is described as an example. The control unit 11 accepts a user's instruction operation of specifying a part of a plurality of moving picture data stored in the hard disk 13 as a recording target. The storage unit 12 stores a list of moving picture data file names which are the recording targets.

When the control unit 11 starts the process shown in Fig. 4 and stores each of the recording target data specified by the file name stored in the storage unit 12 on the recording medium in the compressed state by the set compression method. The predicted value of the total (total capacity) of the estimated sizes of the two is calculated (a calculation process of the predicted value: S1). The control unit 11 checks whether the predicted value calculated in the process S1 exceeds the remaining capacity of the recording medium (S2), and if the predicted value exceeds the remaining capacity of the recording medium (Yes), Among the target data, the recording target data having the largest data size (size when stored in the recording medium) is selected as the recompression candidate (S3), the setting of the compression method is changed, and the process returns to the processing S1 to continue the processing. do.

The control unit 11 also selects as a recompression candidate if the predicted value is less than or equal to the remaining capacity of the recording medium (if No), and recompresses the changed recording target data of the compression method by the compression method after the change. Solution (S4), the process ends. As a result, the recording target data selected as the recompression candidate is recompressed by a compression method having a higher compression efficiency.

The control unit 11 may perform a process of copying and recording each of the specified recording target data onto a recording medium following this processing.

By the above process, recursion until it is determined that the compression efficiency of the largest data size can be recorded on the recording medium while calculating the predicted value in the case of stepwise raising such as, for example, SP → LP or LP → EP. As a result, the predicted value is reduced.

In this case, one of the largest data size is selected as the recompression candidate. However, a plurality of recording target data may be selected in order from the largest data size, and the recompression candidate may be used.

When recompression is still not stored in the recording medium even after recompression, at least one of the recompression candidates may be selected in order from the largest data size before recompression. In this case, the original size is large and concentrated to be recompressed repeatedly.

Furthermore, the selection method of the recompression candidate is not limited to what was said so far. For example, although recompression candidates were selected based on the data size, at least one of the data to be recorded is selected as recompression candidates in order from the lowest compression efficiency for the compression mode. You may also That is, in the case of moving picture data here, the compression efficiency is increased in the order of HQ (high definition), HSP (quality priority), SP (standard), LP (time priority), EP (long time), and SLP (extended time). For this reason, for example, when there is recording target data to be recorded in HQ and recording target data to be recorded in SP, the compression efficiency of the recording target data in HQ is increased, and for example, it is recompressed into HSP. . In addition, when there are a plurality of recording target data compressed by the compression method such that the compression efficiency is the lowest, the data size may be selected as the recompression candidate in order from the higher data size.

In addition, since recompression processing is generally a process with high load, it is preferable not to perform recompression as much as possible. Therefore, the predicted value of the total capacity after recompression may be calculated for each of the possible combinations when selecting the recompression candidate for the data to be recorded. Then, the combination having the smallest number of recording target data selected as the recompression candidate is found among the combinations in which the estimated value of the total capacity after the recompression is less than the free capacity of the recording medium.

In this process, the control unit 11 first enumerates the possible combinations when selecting the recompression candidate from the recording target data. For example, when there are three moving image data of A, B, and C, the following combinations are obtained.

(1) Let A be the recompression candidate.

(2) Let B be the recompression candidate.

(3) Let C be a recompression candidate;

(4) A and B are recompression candidates.

(5) A and C are recompression candidates.

(6) B and C are candidates for recompression.

(7) A, B, and C are candidates for recompression.

The process of enumerating this combination can be performed using a recursive process, as is well known.

The control unit 11 calculates the predicted value of the total capacity when the compression efficiency of the moving image data subjected to recompression candidates is increased in each combination. Since moving image data is taken as an example here, it is only necessary to calculate the predicted value of the total capacity when the compression efficiency is increased by only one step, for example. Then, whether each combination is smaller than the free capacity of the recording medium is examined. Here, for example, (3) a combination of recompression candidates, (5) a combination of recompression candidates, and (6) a combination of recompression candidates, and (7) In a combination where A, B, and C are candidates for recompression, it is assumed that the estimated value of the total capacity is less than the free capacity of the recording medium. In this case, a combination having only one recompression candidate (that is, a combination in which (3) C is a recompression candidate) is found. The control unit 11 then selects C as a recompression candidate. In this example, the number of recorded data subject to recompression candidates is used as the score, and the recompression candidate is selected as the combination having the smallest score. However, the combination is included to include the case where the variation in compression efficiency is different. You may enumerate.

For example, in the case where there are moving picture data A recorded in the HQ and moving picture data B and C recorded in the SP, even when (1) A is recompressed, it is reconstructed into the HSP. There are many more combinations, such as whether to compress, recompress with SP, or recompress with LP, and (4) A is the same as HSP even when A and B are recompressed candidates. Various combinations arise, such as the combination which makes B into LP, the combination which makes A into SP, and turns B into LP.

However, if the compression efficiency fluctuates greatly here, for example, if video data compressed in HQ (high definition) is recompressed in SLP (extended time), deterioration in image quality will be remarkable. Thus, the control unit 11 makes the variation in the compression efficiency as small as possible. Specifically, when the compression efficiency is set in stages, the amount of variation in the compression efficiency can be the difference between the steps due to the recompression. HQ (High Definition), HSP (Quality Priority), SP (Standard), LP (Time Priority). If a step is provided, "1" is used for recompression from HQ to HSP, and "2" for recompression from HQ to SP. In addition, unlike this, the amount of change in compression efficiency can also be defined as the amount of change in data size. For example, when the data size before recompression is S0 and the data size after recompression is S1, the amount of change in the compression efficiency may be | S0-S1 |. Where | · | represents the operation of the absolute value.

That is, the control unit 11 calculates the scores related to the number of data to be recorded and the amount of change in compression efficiency for each of the listed combinations. Specifically, the score σ may be calculated as follows.

σ = μ1N + μ2∑Di

Here, N is the number of data to be recorded that has been recompressed, and Di is the amount of change in the compression efficiency of the data to be recorded which is the i-th recompression candidate. As ΣDi, the total amount of variation in compression efficiency for all recompression candidates is obtained. In addition, μ1 and μ2 are the weights, respectively, and may be determined in advance. For example, when the image quality deterioration is to be as small as possible even if time is taken, the user may be able to set the value such as setting the μ2 to be large and the μ1 to be small. .

The control part 11 finds the combination whose minimum value (sigma) is the minimum, and recompresses the recompression candidate proposed by the found | combined combination with the compression efficiency proposed by the said found combination.

Furthermore, the selection process of the recompression candidate by the control part 11 may use history information of past compression process, for example. In this case, the control part 11 receives the instruction | indication of the recompression candidate and the setting of the compression efficiency at the time of recompression from a user, and is supposed to perform the recompression process according to the said instruction | command. In addition, the content of the instruction is stored in the storage unit 12 and stored.

Specifically, the contents of the past instructions are stored for each genre of moving image data, which is the recording target data (for each news, sports, variety, drama, etc., if a television program is recorded). For example, how many records have been selected in the past as genres, how many of them have been selected as recompression candidates, and what is the average of the variation in compression efficiency (for example, the difference in the stages of compression efficiency). The statistical value is stored in the storage unit 12.

When the recompression candidate is selected, the control unit 11 recompresses the largest data size in order from the recording target data of the genre with the high ratio selected as the recompression candidate in the past with reference to this statistical value. Select as a candidate. Moreover, the compression efficiency used for recompression is determined from the average of the fluctuation amount of compression efficiency.

Thus, according to this embodiment, the user does not need to set recompression by himself, and the convenience regarding adjustment of data size can be improved.

Claims (10)

A data recording apparatus for recording a plurality of recording target data on a recording medium having a storage area having a predetermined capacity, Predictive capacity calculating means for calculating an estimated value of total capacity when the plurality of recording target data is recorded on the recording medium; Recompression candidate selecting means for selecting at least one of the plurality of pieces of recording data as a recompression candidate when the calculated predicted value exceeds the predetermined capacity; Each of the plurality of pieces of recording data is compressed by a predetermined compression method, and the recording method selected as the recompression candidate among the plurality of pieces of recording data is a compression method having a higher compression efficiency than the predetermined compression method. Compression means for changing the recompression process, And the recompression candidate selecting means selects at least one of the plurality of recording target data as recompression candidates in order from the lowest compression efficiency for the compression mode. A data recording apparatus for recording a plurality of recording target data on a recording medium having a storage area having a predetermined capacity, Predictive capacity calculating means for calculating an estimated value of total capacity when the plurality of recording target data is recorded on the recording medium; Recompression candidate selecting means for selecting at least one of the plurality of pieces of recording data as a recompression candidate when the calculated predicted value exceeds the predetermined capacity; Each of the plurality of pieces of recording data is compressed by a predetermined compression method, and the recording method selected as the recompression candidate among the plurality of pieces of recording data is a compression method having a higher compression efficiency than the predetermined compression method. Compression means for changing the recompression process, The recompression candidate selecting means For each of the possible combinations when selecting a recompression candidate from the plurality of recording target data, an estimated value of the total capacity after recompression is calculated, For at least a part of the combination in which the predicted value of the total capacity after the recompression is smaller than the predetermined capacity, a score relating to at least one of the number of data subject to be recompressed and the variation in compression efficiency is calculated, And a recompression candidate is selected based on the score. The method of claim 2, And said score is a score relating to both the number of data to be recorded that has been recompressed and the amount of change in compression efficiency. The method of claim 3, The score is The number of data to be recorded, N, to be recompressed; Sum ∑Di, of the amount of change in compression efficiency for all compression candidates, Using weight μ1, μ2 σ = μ1 × N + μ2 × ∑Di And operating as a data recording apparatus. A data recording apparatus for recording a plurality of recording target data on a recording medium having a storage area having a predetermined capacity, Predictive capacity calculating means for calculating an estimated value of total capacity when the plurality of recording target data is recorded on the recording medium; Recompression candidate selecting means for selecting at least one of the plurality of recording target data as a recompression candidate when the calculated predicted value exceeds the predetermined capacity; Each of the plurality of pieces of recording data is compressed by a predetermined compression method, and the recording method selected as the recompression candidate among the plurality of pieces of recording data is a compression method having a higher compression efficiency than the predetermined compression method. Compression means for recompressing by changing the, Means for storing at least a part of the history of the compression process performed by the user, And said recompression candidate selecting means selects a recompression candidate by referring to said stored history. The method of claim 5, The means for storing at least a part of the history of the compression process performed by the user stores the history of the number selected as the recompression candidate for each genre of the recording target data as a statistical value, The recompression candidate selecting means lists the plurality of recording target data in order from the recording target data of the genre having a high ratio selected as the recompression candidate in the past with reference to the statistical value when selecting the recompression candidate. And selecting at least one of the data having the largest data size among the sequences and the data having the largest average variation of the past compression efficiency as the recompression candidate. The method according to any one of claims 1 to 6, And the recording target data is moving picture data. As a data recording method for recording a plurality of recording target data on a recording medium having a storage area having a predetermined capacity, using a computer, Calculating an estimated value of total capacity when the plurality of recording target data is recorded on the recording medium, When the calculated predicted value exceeds the predetermined capacity, at least one of the plurality of recording target data is selected as a recompression candidate, Each of the plurality of pieces of recording data is compressed by a predetermined compression method, and the recording method selected as the recompression candidate among the plurality of pieces of recording data is a compression method having a higher compression efficiency than the predetermined compression method. Recompress to change And at the time of selecting the recompression candidate, the recompression candidate is selected with reference to the history stored in the means for storing at least a part of the history of the compression process performed by the user. A computer-readable storage medium storing a program for recording a plurality of recording target data in a recording medium having a storage area having a predetermined capacity, the program being stored in a computer. Calculating an estimated value of total capacity when the plurality of recording target data is recorded on the recording medium; When the calculated predicted value exceeds the predetermined capacity, selecting at least one of the plurality of recording target data as a recompression candidate; Storing at least a part of the history of the compression process performed by the user; Each of the plurality of pieces of recording data is compressed by a predetermined compression method, and the recording method selected as the recompression candidate among the plurality of pieces of recording data is a compression method having a higher compression efficiency than the predetermined compression method. To run the recompress step And at the time of selecting the recompression candidate, the recompression candidate is selected with reference to the stored history. delete

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